Merge pull request #141 from ouchadam/readme-data-usage

Add readme section about data usage

README.md

@@ -86,4 +86,36 @@
 
 ---
 
+### Data and Privacy
+
+- Messages once decrypted are stored as plain text within `SmallTalk's` database. _Always encrypted messages_ comes at the cost of performance and limits features like local search. If maximum security is your number priority, `SmallTalk` is not the best option. This database is not easily accessed without rooting or external hardware. 
+
+- (Not yet implemented and may be configurable) Images once decrypted are stored in their plain form within the devices media directories, organised by room metadata. 
+
+- Push notifications contain no sensitive data by using the [event_id_only](https://github.com/ouchadam/small-talk/blob/main/matrix/services/push/src/main/kotlin/app/dapk/st/matrix/push/internal/RegisterPushUseCase.kt#L31) configuration. Push notifications are used as a _push to sync_ mechanism, where the on device sync fetches the actual contents. 
+
+- Passwords are **NEVER** stored within `SmallTalk`. 
+
+- `SmallTalk` does not explicitly talk to servers other than your home-server or track what you do.  __*__
+  - __*__ There is no `SmallTalk` server capturing data from the application however the Google variant likely includes transitive telemetrics through the use of `Firebase` and `Google Play Services` integrations. 
+
+- `SmallTalk` is completely free and will never feature adverts or paid app features. 
+
+---
+
+`SmallTalk` comes in two flavours, `Google` and `FOSS`
+
+##### Google
+- Available through the [Google Play Store](https://play.google.com/store/apps/details?id=app.dapk.st) and [Github Releases](https://github.com/ouchadam/small-talk/releases).
+- Automatic crash and non fatal error tracking via [Firebase Crashlytics](https://firebase.google.com/products/crashlytics).
+- Push notifications provided through [Firebase Cloud Messaging](https://firebase.google.com/docs/cloud-messaging).
+
+##### FOSS
+- Available through the [IzzySoft's F-Droid Repository](https://android.izzysoft.de/repo) and [Github Releases](https://github.com/ouchadam/small-talk/releases).
+- No Google or Firebase services (and their transitive telemetrics).
+- No crash tracking.
+- No push notifications by default,  a separate [UnifiedPush](https://unifiedpush.org/) [distributor](https://unifiedpush.org/users/distributors/) is required.
+
+---
+
 #### Join the conversation @ https://matrix.to/#/#small-talk:iswell.cool